Python：ssl 库高级用法举例和应用详解

import ssl

print(ssl.OPENSSL_VERSION)  # 打印OpenSSL的版本信息，验证模块是否可用

import ssl
import socket

# 创建一个TCP/IP套接字
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.bind(('localhost', 10023))  # 绑定到本地地址和端口
server_socket.listen(5)  # 开始监听，最多接受5个连接

# 创建SSL上下文
context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
context.load_cert_chain(certfile='cert.pem', keyfile='key.pem')  # 加载证书和密钥文件

# 接受新的连接并进行SSL/TLS包装
conn, addr = server_socket.accept()
ssl_conn = context.wrap_socket(conn, server_side=True)
try:
    data = ssl_conn.recv(1024)  # 接收数据
    print(f"Received: {data.decode('utf-8')}")
    ssl_conn.sendall(b"Hello, SSL!")  # 发送数据
finally:
    ssl_conn.close()  # 关闭连接

import ssl
import socket

# 创建一个SSL上下文
context = ssl.create_default_context()

# 创建一个TCP/IP套接字并连接到服务器
server_address = ('localhost', 10023)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
ssl_sock = context.wrap_socket(sock, server_hostname='localhost')
ssl_sock.connect(server_address)

# 发送和接收数据
try:
    ssl_sock.sendall(b'Hello, server!')
    data = ssl_sock.recv(1024)
    print(f"Received: {data.decode('utf-8')}")
finally:
    ssl_sock.close()

import ssl
import socket
from datetime import datetime

# 创建一个SSL上下文
context = ssl.create_default_context()

# 创建一个TCP/IP套接字并连接到服务器
server_address = ('www.example.com', 443)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
ssl_sock = context.wrap_socket(sock, server_hostname='www.example.com')
ssl_sock.connect(server_address)

# 获取服务器证书并解析有效期限
cert = ssl_sock.getpeercert()
not_after = cert['notAfter']
expiry_date = datetime.strptime(not_after, '%b %d %H:%M:%S %Y %Z')
current_date = datetime.utcnow()
print(f"Certificate valid until: {expiry_date}")
print(f"Days remaining: {(expiry_date - current_date).days}")

ssl_sock.close()